/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.metamodel.convert;

import org.apache.metamodel.util.BooleanComparator;

/**
 * A {@link TypeConverter} that converts String values (on the physical layer)
 * to interpreted Booleans.
 */
public class StringToBooleanConverter implements TypeConverter<String, Boolean> {

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toPhysicalValue(Boolean virtualValue) {
		if (virtualValue == null) {
			return null;
		}
		return virtualValue.toString();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Boolean toVirtualValue(String physicalValue) {
		if (physicalValue == null || physicalValue.length() == 0) {
			return null;
		}
		return BooleanComparator.parseBoolean(physicalValue);
	}

}
